Professor Leigh is one of Britain's leading investigative journalists, and winner of the 2007 Paul Foot Award for Campaigning Journalism. David is Assistant Editor at The Guardian, with special responsibility for investigations.
He has also worked in London at the Observer, where he ran an investigation team, and at The Times. He has won seven press awards, including Granada's Investigative Journalist of the Year, the British Press Awards Campaigning Journalist of the Year, and an award from the UK Freedom of Information Campaign.
In 2006 he was Highly Commended for investigations into alleged corruption at BAE Systems. His books include The Liar (an account of the Jonathan Aitken affair); Sleaze (the story of the Neil Hamilton case) and a book campaigning for freedom of information legislation.
- Leigh, D. and Harding, L. (2011). WikiLeaks: Inside Julian Assange's War on Secrecy. Guardian Books. ISBN 978-0-85265-239-8.
- Harding, L., Leigh, D. and Pallister, D. (1999). The Liar: The Fall of Jonathan Aitken. ISBN 978-1-84115-243-1.
- Leigh, D. and Vulliamy, E. (1997). Sleaze:The Corruption of Parliament. 4th Estate, Limited. ISBN 978-1-85702-694-8.
- Leigh, D. and Norton-Taylor, R. (1993). Betrayed: Trial of Matrix Churchill. Bloomsbury Publishing PLC. ISBN 978-0-7475-1552-4.
- Leigh, D. (1988). The Wilson plot: The Intelligence Services and the Discrediting of a Prime Minister. Vintage.
- Leigh, D. (1988). High time: the Life and Times of Howard Marks. ISBN 978-0-04-364023-4.
- Leigh, D. (1980). The Frontiers of Secrecy. Univ Pubns of Amer. ISBN 978-0-313-27093-2.